refactor(reactivity): define hadKey if necessary (#288)

2019-10-15 23:59:40 +08:00 · 2019-10-15 23:59:40 +08:00 · b5209277de
commit b5209277de
parent 4cee06ddab
1 changed files with 1 additions and 1 deletions
--- a/packages/reactivity/src/baseHandlers.ts
+++ b/packages/reactivity/src/baseHandlers.ts
@ -38,12 +38,12 @@ function set(
  receiver: any
 ): boolean {
  value = toRaw(value)
-  const hadKey = hasOwn(target, key)
  const oldValue = target[key]
  if (isRef(oldValue) && !isRef(value)) {
    oldValue.value = value
    return true
  }
+  const hadKey = hasOwn(target, key)
  const result = Reflect.set(target, key, value, receiver)
  // don't trigger if target is something up in the prototype chain of original
  if (target === toRaw(receiver)) {